Rall or ture mill



w. KOPPE N ET AL.

BALL on TUBE MILL Filed Dec. a. 1926 2 Sheds-Sheet 1 /n vento/zs. V 'HZKd'ppezz 7 BPf'E iffer 1, 6,13 July I w. KOPPEN ETAL 63 8 BALL 0R TUBE MILL Filed Dec. a, 1926 2 Sheets-Sheet 2 ln uen foiu.

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Patented July 19, 1927.

UNITED STATES PATENT OFFICE.

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BALI. OB TUBE Application filed December a, .1886, semi Io. 153,420, and in Germany December a, 1925.

The invention relates to aballor tubemill for disintegrating any kind of material to be ground and has for its princi a1 purpose, making the employment sieves, ordinariliy used, superfluous.

Accor ing to the invention, a se aratingchamber, built into the drum or tu e of the mill, is limited towards the preliminary grinding-chamber by concentric rings of.

special shape and design. This insertion,

built into the mill, has been dimensioned com aratively short, so that foreshortening of tliecfi'ective grinding-space does practically not take place. Care has furthermore been taken, that the material to be ground may eventually return from the saidinsertion into the preliminary grinding-chamber. By the arran ement of obliquely disposed scoops into t e insertion, choking-u of the ring-wall gaps is effectively avoide One example of executing the invention is illustrated in the drawings, in which Fi 1 is a longitudinal section through a ba l-, or tube-mill fitted with the novel insertion,

Fig. 2 Fig; 1,

Fig. 3 is a section on the line AB, Fig. 4 a section on the line OD of Fig. 1. Fi 5 is a partial view of the intermediate cham r in enlar ed scale, after the rings have been removed,

Fig. 6 is a section on the line G-H of is a section on the line E-F of Fig. 5, I

ig. 7 illustrates a cone-element provided in the intermediate chamber,

Fi 8 is a section on the line 'I-K of Fi w I %n the drawings, a is the charging-aper- 40 material is preliminarily ground in the preliminary grinding-chamber b, which is filled' with balls. After .-the material has reached the ring-wall g, the fine enough ground material is dischar ed throu h the ring-gaps c, as shown in ig. 2. T e coarser pleces o'f materialand the balls do not obstruct the gaps 0, as the single rings are arched on their surface. The ground material dischar ed through the aps c, is passed to the cham er h, in whio obliquely disposed ture for the material to be ground. The...

scoops i have been provided. This oblique disp acement of the said scoops has the purpose of deflecting the ground material immediateIlyl from the gaps and keep the same open. e chamber h is separated from the fine grinding-chamber Z by a partition is having an opening only in the center. The material to be ground is conveyed in the direction of the arrow 7 into the fine grinding-chamber l,.but the same may fallback into the preliminary grinding-chamber b, if the chamber it should be filled too much. A deflector m is provided in the chamber k, havin about the shape of a double cone, where y discharging the ground material into the fine grinding-chamber l, or the preliminarygrinding-chamber b is efl'ected.

This double cone is illustrated in Figs. 7 v and 8 in an enlarged scale. The double cone m consists of a truncated cone 8 and a more pointed cone t andis provided with lugs u fastened to the inner ring 9.

.' The double conem is consequentl likewise supported by the scoops z', to WhlCh the Fig. 3 illustrates the arrangement of the rings on the ring-wall, Fig. 4 the arrangement of the scoops. The scoops z serve as supports for the concentric rings g. v The scoops i have a flange p, fastened to the wall k and a second flange g. The latter flange g is provided with slots r located at such 8 points, where the slots are situated between the rings 9. On account of the arrangement of the slots r, the ring-shaped aps between the rings g are not interruptei As shown by F1 6, the scoops i are running out pointe at the end of the slot 7*. The ground material is therefore in no way obstructed in its passage through the ring-slots.

The rings g are thus freely suspended and their intermediate spaces form continuous rin -shaped slots in which no ground materia can stick fast as in holes or limited slots. On the contrary, the ground material will be kept permanently moving in the said continuous s ots. j

The inlet-(point of the ring-slots can not be obstructs and an uninterrupted conveyance is inside the insertion efiected by the improved e ciency of the mill obtained thereby. The insertion can easily be built into, any existing mill, eventually even in a multiple arrangement. As shown in Fig. 1, it takes up very little space, so that the effective grinding-surface of the tube is practically not impaired by the same.

The mode of action is as follows: The material charged by the opening a, is more or less disintegrated in the chamber 2') of the tube consequent to the rotation of the tube. The suificiently disintegrated parts pass through the slots between the rings g, into the intermediate chamber d. The material drops hereby upon the oblique scoops i and is thereby subdivided in such a manner, that the coarser parts are retained upon the higher part close to the rings, while the fine particles slide down on the inclined surface and come into the neighbourhood of the Wall it. During rotation of the tube the .thus subdivided material passes over the double cone m and slides down on'the same. material passes over the cone in the chamber Z of the tube, while the coarser parts of the material drop-back into the chamber 6.

We claim 1. Ina ballor tube-mill containing a preliminary grinding chamber, a fine grinding chamber and an intermediate chamber, concentric rings forming the wall of said intermediate chamber facing the preliminary grinding-chamber, said rings having on their entire periphery a free cross-section for the passage of the material to be ground.

2. In a ballor tube-mill containing a reliminary grinding chamber, a fine grin ing chamber and an intermediate chamber,.concentric rings arched convex towards the preliminar y grinding-chamber forming the wall of said intermediate chamber facing the preliminary grinding-chamber, said rings having on their entire peri hery a free cross-section for the passage of t e material to be ground.

3. In a ballor tube-mill containing a preliminary grinding chamber, a fine rinding chamber and an intermediate cham er, concentric rin'gs forming the wall of said intermediate chamber facing .the preliminary grinding-chamber, said rings having on their entire periphery a free cross-section for the passage of the material to be ground, scoops being obliquely disposed'in said intermediate chamber.

4. In a ballor tube-mill containing a pre The finer liminary grinding chamber, a fine grinding chamber and an intermediate cham er, concentric rings forming the wall of said intermediate chamber facing the reliminary grinding-chamber, said rings having on their entire periphery a free cross-section for the passage of the material to be ground, scoops being obliquely disposed in said intermediate chamber, said scoops having the shape of cone mantle sections.

5. In a balloritube-mill containing a reliminary grinding chamber, a fine in ing chamber and an intermediate cham er, concentric rings'arched convex towards the preliminary grinding chamber forming the wall of said intermediate chamber facing the preliminary grinding-chamber, said rln'gs hav ing on their entire periphery a free crosssection for the passage of the material to be ground, scoops being obliquely disposed in said intermediate chamber.

6. In a ballor tube-mill containing a reliminary grinding chamber, a fine rin ing chamber and an intermediate cham er, concentric rings arched convex towards the preliminary grinding chamber forming the wall of said intermediate chamber facing the preliminary grinding chamber, said rings having on their entire peri hery a free crosssection for the passage oi the material to be ground, scoops being obliquely disposed in said intermediate chamber, said scoops having the shape of cone-mantle sections.

7. In a ballor tube-mill containing a reliminary' grinding chamber, a fine in ing chamber and an intermediate cham er, concentric rings forming the wall of said intermediate chamber facing the preliminary grinding chamber, said rings having on their entire periphery a free cross-section for the passage of the material to be ground, scoops being obliquel disposed in said intermediate chamber, said concentric rings being connected by said scoops to the rear wall of the intermediate chamber.

8. In a ballor tube-mill containing a reliminary'grindin chamber, a fine in ing chamber and an intermediate cham er, concentric rings forming the wall of said intermediate chamber facing the preliminary grinding chamber, said rings having on their entire periphery a free cross-section for the passage of the material to be tral opening in the walls of sai intermediate chamber and a double cone-shaped element arranged in the axis of said intermediate chamber, said double cone-shaped element being supported by said concentric rings.

9. In a allor tube-mill containing a preliminary grinding chamber, a fine inding chamber and an intermediate cham er, concentric rings forminfg the wall of said intermediate c amber acing the preliminary grinding chamber, said rings having on their entlre periphery a free cross-section ound, a cen-- for the assage of the material to be ound, scoops eing obli uely disposed in said intermediate cham er, a centralopening in the walls of said intermediate chamber and a double cone-shaped element arranged in the axisof said intermediate chamber,

said double cone-shaped element being supsignatures.

WILHELM KOPPEN. CHRISTIAN PFEIFFER. 

